A comparison between the American submarine campaign against Japanese shipping and the German campaign against Britain exposes the importance of defensive industrial capacity. Britain answered with anti-submarine trawlers, Flower-class corvettes, River-class frigates, Castle-class corvettes, and converted destroyers. Its economy retained rear areas and enough industrial depth to sustain that construction, although a global war stretched those advantages. Japan's weaker escort investment and industrial base left its maritime supply system far more exposed to American submarines.
Notable Point · 22:20-23:26
Escort production separated Britain from Japan in submarine war
Britain's escort-building capacity helped it sustain defenses against submarines that Japan's smaller industrial effort could not match.